nix: drop nix-overlay; enable structuredAttrs & cleanup

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: I8dc2910c36075bef0e1c00459d83e5ea6a6a6964

nix/package.nix

@@ -1,20 +1,15 @@
 {
   lib,
-  makeRustPlatform,
-  rust-bin,
+  rustPlatform,
   llvm,
 }: let
   pname = "microfetch";
   toml = (lib.importTOML ../Cargo.toml).workspace.package;
   inherit (toml) version;
-
-  toolchain = rust-bin.stable.latest;
-  rustWithToolchain = makeRustPlatform {
-    cargo = toolchain.minimal;
-    rustc = toolchain.minimal;
-  };
 in
-  rustWithToolchain.buildRustPackage.override {inherit (llvm) stdenv;} {
+  rustPlatform.buildRustPackage.override {inherit (llvm) stdenv;} (finalAttrs: {
+    __structuredAttrs = true;
+
     inherit pname version;
     src = let
       fs = lib.fileset;
@@ -32,16 +27,18 @@ in
         ];
       };
 
-    cargoLock.lockFile = ../Cargo.lock;
+    cargoLock.lockFile = "${finalAttrs.src}/Cargo.lock";
     enableParallelBuilding = true;
     buildNoDefaultFeatures = true;
     doCheck = false;
+    strictDeps = true;
 
     meta = {
       description = "Microscopic fetch script in Rust, for NixOS systems";
       homepage = "https://github.com/NotAShelf/microfetch";
       license = lib.licenses.gpl3Only;
+      platforms = lib.platforms.linux;
       maintainers = [lib.maintainers.NotAShelf];
       mainProgram = "microfetch";
     };
-  }
+  })

nix/shell.nix

@@ -4,11 +4,10 @@
   rustc,
   mold,
   clang,
-  rust-analyzer-unwrapped,
+  rust-analyzer,
   rustfmt,
   clippy,
   taplo,
-  rustPlatform,
   gnuplot,
 }:
 mkShell {
@@ -20,13 +19,11 @@ mkShell {
     mold
     clang
 
-    rust-analyzer-unwrapped
+    rust-analyzer
     (rustfmt.override {asNightly = true;})
     clippy
     taplo
 
     gnuplot # for Criterion.rs plots
   ];
-
-  env.RUST_SRC_PATH = "${rustPlatform.rustLibSrc}";
 }